XR650 cutting in & out under full load full throttle

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XR650 cutting in & out under full load full throttle

Post  GoannaMan on Sat Mar 15, 2014 9:04 pm

Hey Tech Buddies, Bananatool
The XR pulls like mad through the gears but every now and again, like in the middle or late stage of over taking a car, in top gear the engine coughs for an instant before taking off again. It's not when you first crack the throttle on but at some point as it gathers revs toward the high range. Seems mainly to happen in top gear, like as it passes 100KM/h or more and is most noticeable under full throttle up hill. I ride mainly around Sea level and their is nothing on Bruny Island Higher than about 1,500ft. I am using Premium Unleaded either 95 or 98 RON, have drained the carby, checked the airbox/filter nothing obvious. I have owned the bike since new in 2000 and have only done 5,000KM on it and it has had no modifications. Any suggestions most welcome.
Thanks Heaps
Marc 
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Re: XR650 cutting in & out under full load full throttle

Post  AURORA on Sun Mar 16, 2014 4:41 am

What does your spark plug look like?
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Great Question, I'll whip the tank off and see!

Post  GoannaMan on Sun Mar 16, 2014 7:40 am

Bananatool 
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Re: XR650 cutting in & out under full load full throttle

Post  Mad Frosty on Sun Mar 16, 2014 6:29 pm

Have you just drained the carbie or have you cleaned it really well ?
As that is not the same .
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Yeah Busted Frosty, I just drained it. Thanks Marc

Post  GoannaMan on Sun Mar 16, 2014 8:08 pm

Bananatool 
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Re: XR650 cutting in & out under full load full throttle

Post  Mad Frosty on Mon Mar 17, 2014 8:55 pm

Let us know how it goes  Very Happy 
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Re: XR650 cutting in & out under full load full throttle

Post  BuRP on Tue Mar 18, 2014 10:55 am

"I have owned the bike since new in 2000 and have only done 5,000KM on it and it has had no modifications"

There you go matey, that's your problem - ride it a bit more frequently?
5000km / 14 years = ...... umm, oh wait, eh (sweat), well, it is WAY less than what Mauser rides per weekend!
You see, using it is not abusing it - ride it!!!!  razz 
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Re: XR650 cutting in & out under full load full throttle

Post  bigkuri on Tue Mar 18, 2014 1:03 pm

Yep, drain the entire tank, not just the carb & replace with good fuel (can you get 98?).
New spark plug

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Re: XR650 cutting in & out under full load full throttle

Post  BuRP on Tue Mar 18, 2014 1:57 pm

Geez BigOne, that's not a very clever question to ask an Ozzi from London  Embarassed 
Let me do it for you: "Can you get 86?"


You see, he is on the opposite hemisphere, so you have to write the numbers upside down!
Bleddie Inglis, they lived too long on an island  angry 







 Bump
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Re: XR650 cutting in & out under full load full throttle

Post  bigkuri on Tue Mar 18, 2014 1:59 pm

lol quite right!
Actually he's a Tazzy not an Ocker, so they may have to brew their own Wink  razz 

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Re: XR650 cutting in & out under full load full throttle

Post  AURORA on Sat Mar 22, 2014 11:35 pm

Did you check the float and float height?
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